4. TROUBLE SHOOTING
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4.11.4 SUB MIC troubleshooting
Sub MIC signal is generate by MEMS MIC on Main PCB
Check the MIC hole to
make clear the voice signal path.
Is vioce signal OK?
(TP3)
END
Yes
No
Change the mainboard
Change the sub mic.
Is voice signal OK
END
Yes
No
Change the TWL6040(U803)
Is the voice signal OK?
(TP4)
END
Yes
No
START
Check the MIC signal by loop-back test
or voice recorder